petersen



(No Model.)

' H. PETERSEN.

SEGTIONAL PEDESTAL GRATE. v No. 382,553. Patented May 8, 1888.

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UNITED STATES HENRY PETERSEN, OF LOUIS, MISSOURI, ASSIGNOR OF ONE-HALFCHRISTIAN ANDRISEN, OF SAME PLACE.

PATENT OFFICE.

Sl ECTIONAL PEDESTAL-G RATE.

SPECIFICATION forming part of Letters Patent No. 382,553, dated May8,1888. Lpplication filed Augnst27,1887. Serial to. 248,062. (No model.)

To aZZ whom it may concern.-

Be it known that I, HENRY PETERSEN, of the city of St. Louis, in theState of Missouri, have invented a certain new and useful Improvement inSectional Pedestal-Grates, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,forming part of this specification, and in which-- Figure I is a detailtop View of the grate-bed, showing a number of the adjacent bars inposition. Fig. II is a side view of one of the sectional bars resting onits bed-wall,showing' the division=linebetween thebed-section and theremovablesection that is renewable when it burns out. Fig. III is an endview of aseries of the bars in relative position, sh owing thepedestaltop of the bars, with a pedestal of one row projecting laterallybeyond those of its adjoining rows. Fig. IVis a perspective view ofthesectional bar, showing the renewable section elevated from its seat;and Fig. V is an end view of a pedestal and bar that it surmounts,showing their relative position.

This invention relates to devices to improve the draft-supply and itsintroduction through furnace-grates, and preservation of said gratesfrom burning out; and the invention consists in features of noveltyhereinafter fully described, and pointed out in the claims.

Referring to the drawings, in which similar figures of referenceindicate like parts in all the views,1 represents the bed-walls, onwhich the bed-section 2 of my improved grate-bars rest. The said sectionis provided with bevelfeet, 3, that rest on said bed-wall and aresurmounted by laterally-enlarged ends 4, that, fitting against those ofthe adjoining bars, regulate the draft-spaces between the bars. Thebottoms of the bars are beveled off to a gradually-reduced thicknesstoward their lower edge, and at the upper edge of said section areprovided with recessed bevel-ended slots 5 at suitable distances apart,and slots 6 in the laterally-enlarged ends 4, which the bevel-lugs 7 atthe bottom and rectangular ends 8 of the renewable section 9 of thegrate-bar respectively occupy, and thus securely hold the two sectionsof the bar together.

10 represents diamond-shaped pedestals that surmount the renewablesection of the grate bar. The' 'projectin'g angle corners 11 of thepedestals project out laterally beyondthethickness of the bar that theysurmount. The said renewable section has at one end a detail ped- 5 5estal, 12, integral with said end, for the purpose,

by turning the bars alternately end for end, of locating the projectingangle corners of the pedestals in each row in intervening positions,alternating with and overlapping the projecting ends of those of theadjoining rows on either hand.

It will be seen that the parts of the gratebars that first burn out andwarp are made in separate sections to the bed-pieces, in which 6 arecombined the bottoms and ends, so that the detachable sections arerenewable when they become unserviceable without the loss of thebed-pieces and ends of the grate-bars, which contain the greater weightof casting, and from their position are not exposed to the intense heatthat are the renewable sections with their pedestals; also, by theprovision of the pedestal-floor for the fire-bed, the said fire-bed iscomposed of pedestals in a compact 7 5 square form to resist the heat,presenting about twice the diameter at top of the thickness of thegrate-bar, and in consequence being better able to withstand the heatand shield the bar that they surmount from its destruc- 8o tive effects.At the same time the shape of the pedestals allows of the introductionof the draft through all the varying angles that intervene between them,striking the fuel not only at varied points, but also with a projectile8 5 force in varied directions, to conduce to'its more completeconsumption and prevent the tendency,where there are only singleparallel lines of draft, to consolidate into clinkers, that obstruct thedraft and otherwise prevent the 0 work of combustion.

It will also be seen that as I provide the same or a larger amount ofdraft than is usually supplied between straight gratebars by drawing itthrough narrower apertures around the various angles of thepedestal,both laterally and vertically, there is not the sameopportunity as there is with the wider interstices between the usualstraight bars for coal to fall through and be wasted. roo

I claim as my invention-- 1. In a furnace-grate, the combination of thesectional grate-bars 2 and 9 with snrmounting pedestals 10,substantially as and for the purpose set forth.

2. In a furnacegrate, the combination of the bed-section grate-bar 2,provided with bevelslots 5 and end slots, 6, in which the bevel-lugs 7and end pieces, 8, of the renewable section 9 of the grate'bar engage tounite the sections, substantially as and for the purpose set forth.

3. In a furnace-grate, the combination of the sectional grate-bars 2 and9 and the diamondshaped pedestals 10, arranged to shelter the bars fromthe heat of the furnace and to directthe draft at Various angles anddeliver it with varied projectile inclinations, so that. it may find itsway through the lines of interstices between the coal in the furnace,substantially as and for the purpose set forth.

4. In a furnace-grate, the combination of the bed-section grate-bar, thebevel-feet 3, whose laterally-enlarged ends rest on the bed-walls l ofthe furnace, said grate-bar provided with bevel-slots 5 and slots 6, inwhich the bevellugs 7 and rectangular ends 8 of the renewable sectionalbar 9 engage, said bar 9, with its pedestals 10,arranged to shield thebar 2 from the heat, and when burned to be renewable by elevation fromthe bed-bar and the substitution of a duplicate, substantially as andfor the purpose set forth.

5. In a grate-bar for furnaces, the combination of the bed-sectiongrate-bar 2 and the renewable sectional grate bar 9, havingdiamond-shaped pedestals whose angle corners project between thecorresponding projecting corners of the adjoining bars, leaving narrowinterstices at varied angles for the ascent of the draft into thefurnace, substantially as and for the purpose set forth.

6. In a grate-bar for furnaces, the combina tion of the renewablesectional grate-bar 9, surmounted and protected by the diamondshapedpedestals 10, that angularly direct the draft in varied direetions,thesaid bar attachable to the bed-grate bar 2 and renewable when burned outby the substitution of a duplicate,

substantially as and for the purpose set forth.

HENRY PETERSEN.

In presence of BENJN. A. KNIGHT, J AS. E. KNIGHT.

